Astronomy:101 Aquarii

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Short description: Star in the constellation Aquarius
101 Aquarii
Location of 101 Aquarii (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  23h 33m 16.62300s[1]
Declination −20° 54′ 52.2155″[1]
Apparent magnitude (V) 4.71[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A0 V[4]
U−B color index +0.00[2]
B−V color index +0.02[2]
Astrometry
Radial velocity (Rv)+15[5] km/s
Proper motion (μ) RA: −3.41[1] mas/yr
Dec.: +8.46[1] mas/yr
Parallax (π)11.11 ± 0.67 mas
Distance290 ± 20 ly
(90 ± 5 pc)
Details
Rotational velocity (v sin i)180[6] km/s
Other designations
BD−21 6437, HD 221565, HIP 116247, HR 8939, SAO 191988[7]
Database references
SIMBADdata

101 Aquarii (abbreviated 101 Aqr) is a star in the equatorial constellation of Aquarius. 101 Aquarii is the Flamsteed designation, although it also bears the Bayer designation b3 Aquarii. 101 Aqr is a double star with the designation B 1900. The combined apparent visual magnitude of the pair is 4.71,[2] which is bright enough to be seen with the naked eye from the suburbs. The distance of this star from Earth is estimated as 290 light-years (89 parsecs) based upon parallax measurements.[1]

The brighter member of this system has an apparent magnitude of 4.81. It is an A-type main sequence star with a stellar classification of A0 V.[4] This star is spinning rapidly with a projected rotational velocity of 1 km/s.[6] The fainter companion is a magnitude 7.43 star at an angular separation of 0.840 arcseconds.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode: 1978A&AS...34....1N. 
  3. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 Houk, Nancy (1978), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H. 
  5. ↑ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W. 
  6. ↑ 6.0 6.1 Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R. 
  7. ↑ "* 101 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+101+Aqr. 
  8. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 



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